HTS code 2914.79.30.00 covers "Ketones and quinones, whether or not with other oxygen function, and their halogenated, sulfonated, nitrated, or nitrosated derivatives › Ketone-phenols and ketones with other oxygen function › Other › Anthraquinone disulfonic acid, sodium salt; and 4-(3,4-Dichlorophenyl)-1-tetralone" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.